package cn.tedu.sp06.fb;
/*当限流时，定义返回的降级类*/
import cn.tedu.web.util.JsonResult;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

@Component
public class ItemFB implements FallbackProvider {
    /*
    设置调用哪个后台服务，会应用当前降级类
    */
    @Override
    public String getRoute() {
        return "item-service";
    }

    //返回客户端的响应数据
    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return new ClientHttpResponse() {
            //状态
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR;
            }
            //错误码
            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.value();
            }
            //错误原因
            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.getReasonPhrase();
            }

            @Override
            public void close() {

            }

            //定义返回的内容
            @Override
            public InputStream getBody() throws IOException {
                String json= JsonResult.err().code(500)
                            .msg("调用商品失败").toString();
                return new ByteArrayInputStream(json.getBytes("UTF-8"));
            }

            //响应头的字符类型定义
            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders h = new HttpHeaders();
                h.add("Content-Type","application/json;charset=UTF-8");
                return h;
            }
        };
    }
}
